Destroyer QR# 64

[Jaylee777]

Advertisement - Members don't see this ad

Hi all,

Can someone explain to me why the values for n (total number of trials) and r (number of trials having desired result) differ from the first part of the equation and the following exponents?

P= (nCr)(P)^n(1-P)^r

the answer uses N=3 and R=2 for nCr but 2 and 1 for the exponent values.

thanks in advance

 

[Jaylee777]

anyone?

 

[littlemissy]

yeah nCr is n!/(n-r)!r! and p is the probablity of that event.

 

[Jaylee777]

I understand that; its the different values for the same variable 👎 being used in the equation that was confusing me. It seems like it should read P^r and (1-P)^n-r Another member has helped me understand the concept more clearly so I dont need to memorize the equation. Thanks for the response

yeah nCr is n!/(n-r)!r! and p is the probablity of that event.